Surface imperfections created during fabrication of halide perovskite (HP) films could induce formation of various defect sites that affect device performance and stability. In this work, all‐organic surface modifiers consisting of alkylammonium cations and alkanoate anions are introduced on top of the HP layer to passivate interfacial vacancies and improve moisture tolerance. Passivation using alkylammonium alkanoate does not induce formation of low‐dimensional perovskites species. Instead, the organic species only passivate the perovskite's surface and grain boundaries, which results in enhanced hydrophobic character of the HP films. In terms of photovoltaic application, passivation with alkylammonium alkanoate allows significant reduction in recombination losses and enhancement of open‐circuit voltage. Alongside unchanged short‐circuit current density, power conversion efficiencies of more than 18.5 % can be obtained from the treated sample. Furthermore, the unencapsulated device retains 85 % of its initial PCE upon treatment, whereas the standard 3D perovskite device loses 50 % of its original PCE when both are subjected to ambient environment over 1500 h.

Effects of All-organic Interlayers Surface Modifiers on Perovskite Solar Cells Efficiency and Stability

Surface imperfections are detrimental roots to various defect sites in halide perovskites (HPs) films affecting device performance and stability. To mitigate such fabrication defects, we introduced a new class of all-organic surface modifiers consisting of alkylammonium and alkanoate ions on the surface of HP layer passivating interfacial defects and improve moisture tolerance. Compared to iodidebased salts, these robust carboxylate anions display higher resistant towards oxidation and superior stability across different organic solvents. Resultant perovskites with traceless low dimensional structure demonstrate remarkable device performance with power conversion efficiency (PCE) more than 18.5% and enhanced operational stability retaining 85% initial PCE in ambient over 1500 hours.

Effects of All‐Organic Interlayer Surface Modifiers on the Efficiency and Stability of Perovskite Solar Cells

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Effects of All-organic Interlayers Surface Modifiers on Perovskite Solar Cells Efficiency and Stability

Effects of All‐Organic Interlayer Surface Modifiers on the Efficiency and Stability of Perovskite Solar Cells

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